Stimulation by touching or pulling on which structure is least likely to cause a painful sensation?

Touching or pulling on the postcentral gyrus is least likely to evoke a painful sensation because brain tissue lacks pain receptors. The pain receptors in the skin and other tissues are all free nerve endings. They are widespread in the superficial layers of the skin, as well as in ceain internal tissues, such as the periosteum, the aerial walls, the joint surfaces, and the falx and tentorium in the cranial vault.